/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
package org.openecomp.sdc.common.util;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class JsonUtils {

    public static String toString(JsonElement jsonElement) {
        if (jsonElement == null) {
            return null;
        }
        if (!jsonElement.isJsonNull()) {
            if (jsonElement.isJsonObject() || jsonElement.isJsonArray()) {
                return jsonElement.toString();
            } else {
                return jsonElement.getAsString();
            }
        } else {
            return null;
        }
    }

    public static boolean containsEntry(JsonObject json, String key) {
        return json.get(key) != null;
    }

    public static boolean isEmptyJson(JsonObject json) {
        return json.entrySet().isEmpty();
    }

    public static boolean isEmptyJson(final JsonElement json) {
        if (json == null || json.isJsonNull()) {
            return true;
        }
        if (json.isJsonArray()) {
            return json.getAsJsonArray().isEmpty();
        }
        if (json.isJsonObject()) {
            return isEmptyJson(json.getAsJsonObject());
        }

        return false;
    }

    public static boolean isJsonNullOrEmpty(JsonObject json) {
        return json.isJsonNull() || isEmptyJson(json);
    }
}
